Hi, jada,
Well, the effects of divorce might be a lot less onerous on the kids than growing up in a household where their parents merely tolerate each others' presence and one of them is a drunk (and yes, it WILL get worse as time goes on).
What makes his moving out "unrealistic"? Sometimes a bit of financial hardship is well worth the freedom you get in return.
I've been in two marriages to alcoholics--the first one got sober before we got married. I left after 14 years of marriage (and fifteen years of sobriety) because I simply felt the marriage was not a satisfying one for either one of us. My second husband almost died from drinking, and I married him during a brief period of sobriety. He soon went back to drinking and I left him only months after we got married.
You don't have to decide anything this minute. Keep going to Al-Anon--it was a lifeline for me when things felt unbearable, and eventually I was able to see clearly what I wanted and how to accomplish it.